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Ideally if you're back in control of your financial life, you should keep one or two around. Other than that you should close the rest to reduce the risk of fraud or a payment going through that you may miss.

If you’re not responsible enough to use credit cards, freeze one in a block of ice for those fee times you really need one

If you don’t care about credit, just close them. For car or hotel rentals, just keep the one that has no annual fee

You do need a credit card for those things, car rental in particular. Many won’t rent without one, debit cards not good enough.

While you may not care about your credit score now, you may later if you want to buy a house or other major purchase.

Just throw them in the back of a drawer.

If you pay your hotel or car rental with a credit card they won't even run a credit check.

The main thing is to watch your spending and pay your credit cards in full every month. In fact if you rarely use your cards you might find that you don't look at your statements too often and end up getting hit with late payment fees for unexpected charges.

I’ve made all of my major purchases and am debt free, I no longer finance anything and just pay cash. My biggest concern is leaving them open and being vulnerable to identify theft.

If you’re not taking out new credit, freeze your credit. Do that whether you leave these open or closed. A credit freeze won’t stop someone from hacking and fraudulently using the ones you already have, but there’s fraud protections for that.

I have one that utilites are on. But everything besides utilities are on my debit card. Most won't admit it but unless you do a real budget you'll spend more on a credit card.

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I use one card for a subscription service and one for curbside grocery pickup, paying them off monthly. That keeps them active so I have when needed for travel expenses. One is locked up in my home filing cabinet. The other is wrapped in a long strip of paper in my wallet, so I have to unwrap it to use. The wrapping is a reminder not to use the card frivolously, because after two decades being debt free, I still need that reminder occasionally.

Sounds like you just want to freeze your credit. It’s free and easy to do.

https://www.nerdwallet.com/article/finance/how-to-freeze-credit

You're vulnerable to identity theft regardless of whether you have any active credit cards.